include: configs: phycore-imx8mm: Do not use macro for address

Do not use size macros for addesses. So convert PHYS_SDRAM to address.
No functional change.
Signed-off-by: NTeresa Remmet <t.remmet@phytec.de>

include/configs/phycore_imx8mm.h

@@ -91,7 +91,7 @@
 
 #define CONFIG_SYS_SDRAM_BASE		0x40000000
 
-#define PHYS_SDRAM			SZ_1G
+#define PHYS_SDRAM			0x40000000
 #define PHYS_SDRAM_SIZE                 SZ_2G /* 2GB DDR */
 
 /* UART */